Key Proposals in the Biden Tax Plan
The Biden administration's tax plan centers on raising revenue from high-income households and corporations while expanding tax relief for working families. The most significant proposal restores the top federal income tax rate from 37% to 39.6%, which was the rate before the 2017 Tax Cuts and Jobs Act. This change applies to taxable income above $400,000 for single filers and $450,000 for married couples filing jointly.
Capital gains taxes see the largest shift under the plan. Long-term capital gains for households earning over $1 million would be taxed at ordinary income rates rather than the preferential 15-20% rates currently in effect. For a $500,000 capital gain, this means the difference between paying $100,000 at the current 20% rate and $198,000 at the proposed 39.6% rate.
On the credit side, the Child Tax Credit expands to $3,600 for children under 6 and $3,000 for children ages 6-17, up from the current $2,000 per child. Business owners tracking their accounting profit calculator results should also note the proposed corporate rate increase from 21% to 28%.
How Income Tax Brackets Change
The current seven-bracket system remains intact under the Biden plan, but the top bracket shifts significantly. Under TCJA, the 37% rate applies to income above $578,125 for single filers and $693,750 for married couples. The Biden plan lowers this threshold to $400,000 for single filers and $450,000 for married couples, while raising the rate to 39.6%.
For a single filer earning $500,000, the tax on the last $100,000 of income increases from $37,000 to $39,600, a difference of $2,600. Married couples earning $600,000 jointly face the 39.6% rate on $150,000 of income instead of the 35% bracket under current law. Use the AGI calculator to determine where your income falls relative to these thresholds.
Head of household filers see the 39.6% rate begin at $425,000 of taxable income. The lower brackets (10%, 12%, 22%, 24%, 32%, and 35%) remain unchanged, so middle-income filers below these thresholds experience no direct rate increase from the bracket restructuring.
Capital Gains Rate Restructuring
The capital gains proposal eliminates the preferential rate for households with more than $1 million in combined income. Currently, long-term capital gains on assets held over one year are taxed at 0%, 15%, or 20% depending on income level. Under the Biden plan, that top tier jumps to 39.6%, matching the ordinary income rate for the highest earners.
This change primarily impacts investors, business owners selling companies, and individuals with large stock portfolios. Someone selling a business for $2 million with $1.5 million in other income would see their capital gains tax nearly double. The effective rate including the Net Investment Income Tax of 3.8% reaches 43.4% at the top end.
Tax-loss harvesting and charitable giving of appreciated assets become more valuable strategies under higher capital gains rates. Investors can model growth scenarios with the compound interest growth tool to weigh the benefits of holding versus selling appreciated positions.
Child Tax Credit Expansion Details
The enhanced Child Tax Credit represents one of the largest family tax relief measures in the plan. Children under 6 qualify for $3,600 each, while children ages 6-17 qualify for $3,000. The credit is fully refundable, meaning families with little or no federal tax liability still receive the full amount as a refund.
During 2021, the American Rescue Plan temporarily implemented these higher amounts with monthly advance payments distributed directly to bank accounts. A family with two children under 6 received $7,200 annually instead of the standard $4,000 under current law. The enhanced structure phases out beginning at $75,000 for single filers, $150,000 for married couples, and $112,500 for head of household.
Families tracking their overall financial health can compare tax credit results with the net worth calculator to see how reduced tax burdens contribute to wealth building and long-term savings goals over time.
Social Security Payroll Tax Changes
The Social Security payroll tax currently applies to earnings up to $168,600, which is the 2024 wage base cap. The Biden plan reinstates the tax on earnings above $400,000, creating a gap between the existing wage base and the new upper threshold. Employees pay 6.2% of earnings and employers match with another 6.2%.
Self-employed individuals cover both portions at 12.4% on net earnings above $400,000. A self-employed professional earning $500,000 pays an additional $12,400 in Social Security tax compared to current law. Over a decade of similar earnings, this accumulates to more than $124,000 in extra payroll taxes that flow into the Social Security trust fund.
The gap between $168,600 and $400,000 is designed to close gradually over time as the wage base increases through annual inflation adjustments. Congress has not specified a timeline for full elimination of this donut hole structure.
Corporate Tax Rate and Business Impact
Corporate tax rates rise from 21% to 28% under the plan, partially rolling back the TCJA reduction from 35%. A corporation with $10 million in taxable profits pays $2.1 million at 21% versus $2.8 million at 28%, an annual increase of $700,000. Businesses should evaluate their after tax cost of debt calculator figures to understand how higher rates change the after-tax cost of borrowing.
The plan includes a 15% minimum tax on book income for corporations with profits exceeding $2 billion. This targets companies that use deductions, credits, and accelerated depreciation to pay effective rates well below the statutory 21%. Shareholders may see reduced dividends and lower earnings per share as corporate tax burdens increase.
Small business owners structured as pass-through entities like S-corporations, LLCs, and partnerships face the individual rate changes rather than the corporate rate hike. Evaluating ROI calculator projections helps business owners assess whether restructuring their entity type makes sense under the new rate environment.
Minimum Tax for High Net Worth Individuals
The plan introduces a 20% minimum tax on all income, including unrealized capital gains, for households worth more than $100 million. This billionaire minimum income tax addresses strategies that allow ultra-wealthy individuals to access wealth through loans against appreciated assets without triggering taxable events under current law.
Unrealized gains on publicly traded securities would be marked to market annually under the proposal. For non-liquid assets like real estate or private business interests, the tax applies at death or upon sale. Taxpayers can check their exposure using the alternative minimum tax estimator for a parallel AMT calculation.
The IRS would gain targeted enforcement funding specifically aimed at high-income tax compliance. The plan directs additional audit resources toward large partnerships, multinational corporations, and individual taxpayers with reported incomes above $400,000.
Retirement Planning Under Higher Rates
Higher marginal tax rates increase the value of tax-deferred retirement contributions. Workers can reduce taxable income by maximizing 401(k) contributions, which allow $23,000 in 2024 or $30,500 for those aged 50 and older. Model your savings trajectory with the 401k retirement calculator to see the compounding benefit of maximizing contributions under a higher-rate future.
Roth conversions become more attractive when current rates are lower than expected future rates. Converting $100,000 from a traditional IRA to a Roth at 24% costs $24,000 in tax today but avoids paying 39.6% on that money if rates rise later. The breakeven depends on investment growth rate, time horizon, and whether legislative changes actually take effect.
Estate planning faces complications from the proposed elimination of stepped-up basis for capital gains above $1 million. Heirs inheriting appreciated assets would owe capital gains tax based on the original purchase price rather than the fair market value at death. This makes lifetime gifting strategies and irrevocable trust structures more relevant for wealth transfer planning under the proposed changes.